Get Dual channel DDR or DDR2 for P5GDC-V?

I am thinking of buying memory for my new LGA775 board.
Option1:
1GB DDR PC3200 (2x512MB) for dual channel mode. From my understanding it
should run at 400Mhz * 2 = 800Mhz in dual channel mode?

Option2:
1GB DDR2 533Mhz. I am not familiar with DDR2 technology. Will it run at
533Mhz or 533Mhz * 2=1066Mhz? The P5GDC-V motherboard supports 800Mhz FSB,
so 1066Mhz is over the limit.

Please let me know what option I should go with. Thanks

In article , "binhlswan"
wrote:

I am thinking of buying memory for my new LGA775 board.
Option1:
1GB DDR PC3200 (2x512MB) for dual channel mode. From my understanding it
should run at 400Mhz * 2 = 800Mhz in dual channel mode?

Option2:
1GB DDR2 533Mhz. I am not familiar with DDR2 technology. Will it run at
533Mhz or 533Mhz * 2=1066Mhz? The P5GDC-V motherboard supports 800Mhz FSB,
so 1066Mhz is over the limit.

Please let me know what option I should go with. Thanks

------------------------------ DDR2 --------------------------------
http://www.anandtech.com/memory/showdoc.aspx?i=2306&p=8 (test setup)
Normal memory might be 4-4-4-12, so this stuff is special.

533DDR2 3-2-2-8 200x12 = 2.4 GHz 800FSB 126 seconds
600DDR2 3-2-2-8 200x12 = 2.4 GHz 800FSB 124 seconds
711DDR2 4-2-2-8 237x12 = 2.84GHz 948FSB 106 seconds

533DDR2 3-2-2-8 266x12 = 3.2GHz 1066FSB 98 seconds
711DDR2 4-2-2-8 266x12 = 3.2GHz 1066FSB 96 seconds
821DDR2 4-2-3-8 308x12 = 3.7GHz 1232FSB 84 seconds

------------------------------ DDR --------------------------------
The 2145 article shows the test setup. The second link adds a few
more memories. Third link is a special memory that can only be
used with special high voltage motherboards (DFI or OCZ Dimm booster
with compatible motherboard) and I only mention it as an unusable
extreme case (no results shown, as the tests were with an
Athlon64 board).

http://www.anandtech.com/memory/show...px?i=2145&p=14
http://www.anandtech.com/memory/showdoc.aspx?i=2235
http://www.anandtech.com/memory/showdoc.aspx?i=2369 (OCZ PC4000 VX)

2.4GHZ processor at stock, overclocked to levels shown. DDR 2-2-2
memory used. Timings would not be a constant 2-2-2, but would
have to slacken as clock rate rises. All except for OCZ VX, which
can now do DDR500 2-2-2 (but VX results not shown).

(article 2145) (Article 2235)
800FSB/DDR400 - 2.4GHz Super-PI 2M 128-133 seconds 126-133
866FSB/DDR433 - 2.6Ghz 118-121 seconds 118-122
933FSB/DDR466 - 2.8GHz 111-115 seconds 111-115
1000FSB/DDR500 - 3.0Ghz 104-109 seconds 103-109
"Highest possible" 92-113 seconds 92-113
1066FSB/DDR533 - 3.2Ghz ------- 97-100

--------------------------------------------------------------
What can we conclude ? Well, I suppose nothing, seeing as the
results are not an attempt to directly compare the memory
types on your exact motherboard. That being said...

The first line in each table, operates at the same processor
core clock, and gives the same results. That means DDR400 memory
is equal to DDR2-533 memory (given you buy low latency type for each).

The DDR466 is falling slightly behind the DDR2-711 memory.
DDR533 (PC4200) memory might be equivalent to DDR2-711.

The DDR2 results were obtained on a 925XE motherboard, which
gives some options not available on your board. Perhaps you
can select some representative results from the table above.

Here is another comparison article, only this one uses the same
motherboard for both DDR and DDR2.

http://www.ocworkbench.com/2004/guides/ddrvsddr2/p1.htm
http://www.xbitlabs.com/articles/mem.../ddr2-ddr.html

Page 5 of the Xbitlabs article, shows how little impoct the
timings of the modules have on the memory bandwidth. The table
on page 5 compares two 3.4Ghz Pentiums, using different
Northbridges, so again, this is not a valid way to rate
the memories on your board, but it will be pretty close.

Maybe some day, you will be able to tell us exactly
what the answer is :-)

Paul